WJEC A Level Chemistry
WJEC A Level Chemistry 3.3 Chemistry of the p-block Exam Questions
Free WJEC A Level Chemistry exam questions on 3.3 Chemistry of the p-block, with mark schemes. Covers group 3, 4 and 7 chemistry, inert pair effect, amphoteric oxides and the halogens.
3.3 Chemistry of the p-block exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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WJEC A Level Chemistry Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About WJEC A Level Chemistry 3.3 Chemistry of the p-block
This topic covers trends in the p-block.
What you need to know
- Inert pair effect Lower oxidation states become more stable down groups 3 and 4, for example Pb(II).
- Amphoteric behaviour Aluminium and lead oxides react with acids and bases.
- Group 3 Electron-deficient compounds such as BCl₃ and AlCl₃ dimers.
- Group 7 Halogen redox chemistry and reactions of halides with concentrated sulfuric acid.
Common mistakes in 3.3 Chemistry of the p-block
- Forgetting the +2 state is more stable for lead.
- Confusing amphoteric with neutral.
- Not explaining why HI reduces sulfuric acid further than HCl.
Try three 3.3 Chemistry of the p-block exam-style questions
1. Define amphoteric. (1 mark)
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Able to react as both an acid and a base.
2. Explain why PbO₂ is a strong oxidising agent. (2 marks)
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The +2 oxidation state of lead is more stable (1) due to the inert pair effect, so Pb(IV) is readily reduced (1).
3. Explain why AlCl₃ forms a dimer. (2 marks)
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Al is electron deficient (1), so a lone pair from Cl on another molecule forms a dative bond (1).
3.3 Chemistry of the p-block FAQs
What does Chemistry of the p-block cover?
Trends in groups 3, 4 and 7, the inert pair effect and amphoterism.
Which practical links here?
Reactions of halides with concentrated sulfuric acid.
What is the inert pair effect?
The reluctance of the s electrons to take part in bonding down a group.
Revise this topic with flashcards: WJEC A Level Chemistry Flashcards, with mark scheme answers for Anki and Quizlet.
